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Effect of different factors on the melanin yield of Inonotus hispidus. (A) Carbon source; (B) Nitrogen source; (C) Carbon-to-nitrogen ratio; (D) Liquid-to-material ratio; (E) pH; (F) Tyrosine. (A,B,E) compared with the blank group; (C,D,F) compared with the front group. * p < 0.05, ** p < 0.01.
